A Downing Street spokesperson said:

In separate phone calls the Prime Minister made clear the importance of restoring a power-sharing Executive to Northern Ireland as soon as possible and she recognised their continued leadership towards reaching agreement.

They discussed key outstanding issues that remain for both parties and the Prime Minister encouraged both leaders to come to an agreement soon in the interests of everyone in Northern Ireland.

The Prime Minister assured them both that the Northern Ireland Secretary would continue to work closely with the parties towards a successful outcome.